[1] BALL G A,MOREY W W,GLENN W H.Standing-wave monomode erbium fiber laser[J].IEEE Photonics Technology Letters,1991,3(7):613-615.
[2] WANG A T,MING H,Xie J P,et al.Single-frequency Qswitched erbium-doped fiber ring laser by combination of a distributed Bragg reflector laser and a Mach-Zender interferometer[J].Applied Optics,2003,42(18):3528-3530.
[4] MAO Q H,LIT J W Y.Multiwavelength erbium-doped fiber lasers with cascaded FBG actively overlapping cavities[J].IEEE/OSA Journal of Lightwave Technology,2003,20(1):160-169.
[5] NILSSON J,ALAM S U,ALVAREZ-CHAVEZ J A,et al.High-power and tunable operation of erbium-ytterbium codoped cladding-pumped fiber lasers[J].IEEE Journal of Quantum Electronics,2003,39(8):987-994.
[6] BELLEMARE A.Continuous-wave silica-based erbium-doped fibre lasers[J].Progress in Quantum Electronics,2003,27(4):211-266.
[7] KRINGLEBOTN J T,ARCHAMBAULT J L,REEKIE L,et al.Er3+Yb3+ codoped fiber distributed-feedback laser[J].Optics Letters,1994,19(24):2101-2103.
[8] ASSEH A,STOROY H,KRINGLEBOTN J T,et al.10 cm YB3+ DFB fiber laser with permanent phase-shifted grating[J].Electronics Letters,1995,31(12):969-970.
[9] PASCHOTTA R,NISSON J,BARBER P R,et al.Lifetime quenching in Yb-doped fibres[J].Optics Communications,1997,136(4):375-378.
[10] BROER M M,KROL D M,DIGIOVANNI D J.Highly nonlinear near-resonant photodarkening in a thulium-doped aluminosilicate glass fiber[J].Optics Letters,1993,18(10):799-801.
[11] BARBER P R,PASCHOTTA R,TROPPER A C,et al.Infrared-induced photodarkening in Tm-doped fluoride fibers[J].Optics Letters,1995,20(21):2195-2197.
[12] KOPONEN J,SODERLUND M,TAMMELA S,et al.Photodarkening in ytterbium-doped silica fibers[J].SPIE,2005,5990:599008_1-599008_10.
